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<html lang="en">
    <head>
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        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <div id="app">
            <input type="text" v-focus:src.stop.prevent.a="1+1" />
        </div>
        <script src="./vue.js"></script>
        <script>
            let vm = new Vue({
                el: "#app",
                data: {},

                directives: {
                    focus: {
                        inserted: function (el, binding, vnode, oldVnode) {
                            el.focus();
                        },
                    },
                },
            });
        </script>
    </body>
</html>
